I'm trying to understand how time estimation field works for parent issues when it is set/modified for subtasks. So far, it looks like this:
1. If I don't set estimate for parent issue, and add a subtask with set estimate, it'll add to the parent issues's estimate. Similar for removal of subtasks.
2. I I don't set estimate for parent issue, and modify time estimate for a subtask, it it reflected in the parent task.
3. Once I do any modification to estimate of the parent issue (including setting it to "?" again), no modifications and additions/removals affect this estimate.
Is the above correct? If it is, is there a chance for me to reset the value in the "Estimation" field and make it track estimates from subtasks again? My usecase is simple: I have a couple of high-level tasks which hadn't been split into subtasks yet, but for which some kind of estimate is available. Once I start to make a detailed plan for the task, I split it into several subtasks, for which I enter their own estimates. By that point in time, the estimate on the parent task no longer makes sense - but I can't reset it, or otherwise make it match the sum of estimates of child tasks.